摘要： English is useful language. A. A , an B. / , a C. The , an D. / , an
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English is___ useful language because people in many countries are using it.
A. a????????????? ????????????? ???????? B. an????????????? ????????????? ???? C. the????????????? ????????????? ??? D. /
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English is ________ useful language so that most people speak it as ________ second language.
A．a; the B．an; the C．an; a D．a; a
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